Ph problems need educated advice pls..

Hey all . Ive got a big problem and not sure how to go about fixing it... Im running a sannies Killing Fields shes almost 8 weeks ,so shes got some time yet.
Soil FFof
Temps 79-83F over 12 hours
400w HPS running about 8ins from the top of the plant..
Rh ,Low mid 20's
Water is R/o That is from my house .. And technaflora nutes..
Ok whats going on is , My ph out the R/O tap is 6.8 which sould be ok 6.4 would be better. Im useing Technaflora nutes ,Thats water water feed .. BUT whats happening is when i mix the nutes it drops the ph to 6.0 .. The plant looks like shit light green and yellowing .. So whats happening here? Is the plant getting water @ 6.8 Then when i got to feed the ph is 6 she can take up the food? thus starving? ph flucuations cant be good .. Should i flush it with ph adjusted water? and go from there or just ride it out? useing ph ed nutes? The plant looks pretty unhealthy but the bud sites looks fantastic and very big for the size of plant .. i dont get it..
Pics would be good .But im a firm believer in not posting something could hauntt you later..

NOW the the scrub i am never checked ph so ya its def my fault live an learn i guess. ordered ph equipment GH ph contol kit, and Milwaukee Instruments pH600AQ pH Tester , with GH calibrateing solution.

Thank all..

Oh i really do think this is a ph problem ive went through a long list from temps to deficiencies .Technaflora has everthing a plant could ever want to eat. A lock out or a partial lockout is all i can come up with.

If your ph drops to 6.0 after mixing your nutes, why don't you adjust it with ph up?

My tap water is like 7.8, and ive been growing in MG soil, which has shit for Mn in it. The first issue I run into is Mn def, even with my ph being so high going in. If you're in the 6.5ish range I would look at other issues first. Look at the ffof bag for contents(i think its pretty all incompassing tho), the check your nutes lablel, and try to see if there is another that is missing as far a macro/micro nutes, or even something that might be doubling up. In this way you can narrow down whether its a deficiency or too much of something.
Beyond that its hard to say without a pic. You could always imgur a pic, then pm me with the link and i can post. As long as theres nothing in the picture that could lead to you its not really a risk.

I think I am having a similar issue with too low of a ph locking out nutrients. Blame it on the ph adjusting nutes, check you ph after adding nutes and adjust up to 6.5. But seeing as the ph is so low a good leeching or flush would do some good. Flush/leech with at least the same amount of gallons of water as the size of the pot. Check the ph of the runoff water 3/4 of the way through the process and when you are in the clear, add 1/4 to 1/2 strength nutes to the last water you give them. Just my .02 worth!

Try feed,feed than water...instead of water,water,feed....even at 6.0 the foxfarms Should. Be fine for a buffer to supply everything ..probably. starving them if p and k .

N how often are you hitting them with calmag?

Corso312 said:

Try feed,feed than water...instead of water,water,feed....even at 6.0 the foxfarms Should. Be fine for a buffer to supply everything ..probably. starving them if p and k .

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I think i would prob fry the plant if i feed,feed,water .. the nute mix runs aroun 1450 ppm .Imo thats on the heavy side. But i def see youre point ..

Corso312 said:

N how often are you hitting them with calmag?

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Yeah The plant gets Cal/Mag every feeding 2.5ml per gal. I did consider over/under watering ,I dont see it . Now dont get me wrong here. The plant isnt all crspy and wilted and all that.No burnt leaf tips. Shes def very alive and flowering heavy Bout 3.5ft tall ,Root bound isnt an option . 3.5gal pot .good fit for the plant size . .In a 3x3x6 tent ,inline fan with carbon ,decent rig .But the leaves are perky but light green and look dyhydrated ,They look very strange .Now when i water that goes about every two days I water till i get good to heavy runoff ,and drain all the runoff from catch tray.I dont completly let the soil dry out ,Reason being , overly dry soil isnt a good thing. and sucks to hydrate. Half gallon or so water, same for nutes . Ive used the Technaflora nutes for a few cycles with very good results .Imho its pretty decent nutes.

I did decide to go ahead and flush/leach the soil ,with 6.6ph R/o water .Checked the runoff @6.4ish .The plant def showed an improvment ,More perky and alittle greener .Now remeber i just feed the day before so the soil was still wet .
I just really do think this is a Ph problem ,Thus starving plant. I just dont think the plant is feeding on the 6.0ph nute solution, i could be wrong. But Theres alot of PH fluc. from feed to just water(water ph 6.8,Nutes ph 6.0) and on top of that the runoff with nutes is about 5.5ph. .. At this point @ 8 weeks all i can do really is get ph right and take it easy on the plant see what she does ?? and go from there ..
Sorry no pics it really would have helped alot in this case .even if i wanted to take pics ,i wouldnt beable to get the detail needed .cuase my camera sucks. Sorry
But HEY! thanks for the advice

Hmmm should not have to add calmag every feed...way too often IMO...the overdose of CA and mg could be locking out n and p.

The pH of RO water is utterly and completely meaningless. It has practically ZERO buffering ability, because it has practically ZERO dissolved solids. This means it will take on the pH of whatever you put in it (or the pH of your medium if you use it straight).

My guess is that pH is not your issue. What are the NPK numbers of this technaflora? My guess is it has VERY little if any nitrogen in it. Did you start using it as soon as you flipped to bloom? Plants need LOTS of N available during the stretch phase (your plant is essentially vegging at a very fast rate). This is true for all strains, but especially true for long flowering ones. They need some nitrogen to get them through. Too late to fix that now, pretty much have to ride it out.

I bought 2 of those Milwaukee Ph meters.
My buddy's lasted 2 months and mine lasted 4.
Took very good care of it too.
Good luck with your new meter!
Calibrate it often.

Lilgiant, you stored probe in cap with a lil water?

Masonic72 said:

I think i would prob fry the plant if i feed,feed,water .. the nute mix runs aroun 1450 ppm .Imo thats on the heavy side. But i def see youre point ..

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if you lower the ppm you can feed more often which is better. less is more. Whats the pH and EC of your soil mix? That makes a big difference.

Not to mention that higher ppm will lower your Ph.

SpicySativa said:

The pH of RO water is utterly and completely meaningless. It has practically ZERO buffering ability, because it has practically ZERO dissolved solids. This means it will take on the pH of whatever you put in it (or the pH of your medium if you use it straight).

My guess is that pH is not your issue. What are the NPK numbers of this technaflora? My guess is it has VERY little if any nitrogen in it. Did you start using it as soon as you flipped to bloom? Plants need LOTS of N available during the stretch phase (your plant is essentially vegging at a very fast rate). This is true for all strains, but especially true for long flowering ones. They need some nitrogen to get them through. Too late to fix that now, pretty much have to ride it out.

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I started bloom nutes two weeks after flipping lights . There is a list of nutes that need to be mixed with this line up http://www.technaflora.com/indexProduct.php?ID=115 i dont really want to type all the stuff thats in it. But there is still a good amount of N that goes into the bloom mix. Even at one point i went back to veg nutes for two feedings (water,water ,feed) with no change . So yeah like i said ,just going to ride it out. This is my first real go at sativa . i do have a Northern Lights next to it .And the NL Looks wonderful .Same nutes ,watered from the same jug ect ect . frosty as shit.
Like i said this is Killing Fields from sannies. The flowers look great. purple ,plump and solid. nice Tricome production .Temp are high 70's to low 80's over the course of 12 hours ,78 to 83 to be exact .
Theres something IM not doing right.. id like to try to figure it out .so i can improve my skills .
But spicy the thing is this plant looked off from day 1 but still kept growing . Thinking this thing isnt gonna do very well ,it continued to grow and i wasnt too worried or expecting much. Till she started to really show What these buds where gonna be like. It really shocked me . I cant help to think that maybe she needs more ??? but dont want to risk it at this point..
heres a link to the instructions for mixing just click USA version http://www.technaflora.com/mixingcharts if your interested..
Thanks again all..

Are Sativas generaly not big eaters? well either way i will be backing off the nutes by half at least . I flushed/leached 2 days ago .Tonight she was very dry ,more dry than normal. watered adjusted ph to 6.5 . i do hope that ph meter is decent .but 20bucks sounds better than a $9 one.
I do agree about higher ppm will lower ph .thats generally how it works ( not being a smartass) lol . The mixing instructions says it brings the solution to 6.0 . sure as shit its right there.
Thanks guys it helps alot ..

Corso312 said:

Lilgiant, you stored probe in cap with a lil water?

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Yes i sure did.Always stored it in fresh cool water.
Cleaned the end with a soft tooth brush,and calibrated it regularly.
My buddy also took good care of his too.
Im not playing games with this meter crap no more! Im investing in a bad ass meter.

Treeonmyhead12 said:

My tap water is like 7.8, and ive been growing in MG soil, which has shit for Mn in it. The first issue I run into is Mn def, even with my ph being so high going in. If you're in the 6.5ish range I would look at other issues first. Look at the ffof bag for contents(i think its pretty all incompassing tho), the check your nutes lablel, and try to see if there is another that is missing as far a macro/micro nutes, or even something that might be doubling up. In this way you can narrow down whether its a deficiency or too much of something.
Beyond that its hard to say without a pic. You could always imgur a pic, then pm me with the link and i can post. As long as theres nothing in the picture that could lead to you its not really a risk.

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LOL, I have 7.9 on my tap, and am in MG also.

Rh ,Low mid 20's

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Isn't RH in the mid 20's a bit low ?
I let my bud room get into the low 20's and the buds close to lights burnt, and dried out...
Remember, if your RH at plant pot is low 20%... then up near your lights RH will be low teens [dryer hotter air] or even singel digits...
Good luck...